Question

What do all mammals have in common?

Select the three correct answers.
They have a constant internal temperature.
Their babies develop inside an egg.
They have one type of tooth.
They have scales on their skin.
They have hair at some point in their lives.
They feed their young with milk.

Answer 1

All mammals share a constant internal temperature, give birth to live young, and feed their young with milk.

Step-by-step explanation:

All mammals have in common three main characteristics:

1. They have a constant internal temperature, which means they are warm-blooded.
2. They give birth to live young that develop inside their bodies.
3. They have mammary glands that produce milk to feed their young.

For example, a dog, a human, and a whale are all mammals and share these features.

Learn more about Characteristics of mammals